INGREDIENTS
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Nonstick spray for the pan
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2 1/2 cups unbleached all-purpose flour
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3/4 teaspoon salt
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1 1/2 teaspoons baking powder
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1/4 teaspoon baking soda
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1/2 to 2/3 cup sugar
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1 tablespoon grated lemon zest
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1 1/2 cups buttermilk
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2 tablespoons fresh lemon juice
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1 large egg
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1 tablespoon vanilla extract
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4 tablespoons (1/2 stick) unsalted butter, melted
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1 1/2 cups blueberries (fresh or frozen)